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https://github.com/aaru-dps/Aaru.git
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Natalia Portillo
828c1e3da0
Introduces constant fields for respective debug module names, replacing the hardcoded ones. This is done to standardize the naming convention, reduce redundancy and potentially avoid any typos or name mismatches across the project. This change makes the code more maintainable and easier to update in case module names need to be changed.
105 lines
4.5 KiB
C#
105 lines
4.5 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Identify.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies Sydex TeleDisk disk images.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.IO;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Aaru.Helpers;
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namespace Aaru.DiscImages;
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public sealed partial class TeleDisk
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{
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/// <inheritdoc />
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public bool Identify(IFilter imageFilter)
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{
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_header = new Header();
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byte[] headerBytes = new byte[12];
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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stream.EnsureRead(headerBytes, 0, 12);
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_header.Signature = BitConverter.ToUInt16(headerBytes, 0);
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if(_header.Signature != TD_MAGIC &&
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_header.Signature != TD_ADV_COMP_MAGIC)
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return false;
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_header.Sequence = headerBytes[2];
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_header.DiskSet = headerBytes[3];
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_header.Version = headerBytes[4];
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_header.DataRate = headerBytes[5];
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_header.DriveType = headerBytes[6];
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_header.Stepping = headerBytes[7];
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_header.DosAllocation = headerBytes[8];
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_header.Sides = headerBytes[9];
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_header.Crc = BitConverter.ToUInt16(headerBytes, 10);
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byte[] headerBytesForCrc = new byte[10];
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Array.Copy(headerBytes, headerBytesForCrc, 10);
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ushort calculatedHeaderCrc = TeleDiskCrc(0x0000, headerBytesForCrc);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.signature = 0x{0:X4}", _header.Signature);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.sequence = 0x{0:X2}", _header.Sequence);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.diskSet = 0x{0:X2}", _header.DiskSet);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.version = 0x{0:X2}", _header.Version);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.dataRate = 0x{0:X2}", _header.DataRate);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.driveType = 0x{0:X2}", _header.DriveType);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.stepping = 0x{0:X2}", _header.Stepping);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.dosAllocation = 0x{0:X2}", _header.DosAllocation);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.sides = 0x{0:X2}", _header.Sides);
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AaruConsole.DebugWriteLine(MODULE_NAME, "header.crc = 0x{0:X4}", _header.Crc);
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.calculated_header_crc_equals_0_X4,
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calculatedHeaderCrc);
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// We need more checks as the magic is too simply.
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// This may deny legal images
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// That would be much of a coincidence
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if(_header.Crc == calculatedHeaderCrc)
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return true;
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if(_header.Sequence != 0x00)
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return false;
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if(_header.DataRate != DATA_RATE_250_KBPS &&
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_header.DataRate != DATA_RATE_300_KBPS &&
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_header.DataRate != DATA_RATE_500_KBPS)
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return false;
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return _header.DriveType is DRIVE_TYPE_35_DD or DRIVE_TYPE_35_ED or DRIVE_TYPE_35_HD or DRIVE_TYPE_525_DD
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or DRIVE_TYPE_525_HD or DRIVE_TYPE_525_HD_DD_DISK or DRIVE_TYPE_8_INCH;
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}
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} |